FRESNEL LENS AND PRODUCTION METHOD FOR SAME

Provided is a Fresnel lens that includes prisms with a mountain-like shape disposed at narrow pitches and having a shape in which a slope from a protruded part to a recessed part is steep, and a production method of the Fresnel lens. The Fresnel lens according to the present invention is a molded an...

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Bibliographische Detailangaben
Hauptverfasser:	FUJIKAWA, Takeshi, FUKUI, Sadayuki
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Provided is a Fresnel lens that includes prisms with a mountain-like shape disposed at narrow pitches and having a shape in which a slope from a protruded part to a recessed part is steep, and a production method of the Fresnel lens. The Fresnel lens according to the present invention is a molded and cured product of a curable composition having a contact angle with respect to a mold of 50° or less, wherein the Fresnel lens includes two or more prisms concentrically, and a cross-sectional face of the two or more prisms has a mountain-like shape in which a ratio (h/w) of a height (h) to a width (w) is 0.3 or greater, and the height (h) is 0.5 mm or less. The mold is preferably a silicone mold. A breaking strain of a cured product of the curable composition is preferably from 0.1% to 30%.